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English definition of “ought”

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ought

modal verb [+ to infinitive]  /ɔt/ ( present tense ought) us  

ought modal verb [+ to infinitive] (DUTY)

used to say that it is necessary or desirable to perform the action expressed in the verb: We ought to clean up before we go home. She really ought to apologize.

ought modal verb [+ to infinitive] (PROBABLE)

used to say that the action expressed in the verb is probable or expected: He ought to be home by seven o’clock. The curtains ought to be ready on Monday. At his age, he ought to have known better.
(Definition of ought from the Cambridge Academic Content Dictionary © Cambridge University Press)
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